Ethanol of 50 % purity is used in an esterification column. The quality of the ethanol presents mass concentration fluctuations of ± 10 %. Compute the measuring domain of the bubbling differential pressure transducerΔp, used for the concentration measurement. The following parameters are given: immersion difference between the tubes is Δh = 0.1 m, the reference liquid is pure ethanol at the temperature of 20∘C. The differential pressure is converted in a standard signal ranging from 4 mA to 20 mA by an electronic transmitter. Compute the errors caused by the summer-winter temperature changes of ΔT∘= 30 K. The density-concentration relationship is presented in Tab. 7.5, the volumetric thermal expansion is 𝛾 = 10−3K−1and the density at the temperature of T∘= 303 K is ρet= 0.781 kg/dm3for the pure ethanol.
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